Major Description
Not sure if this is handled better in procedure based WAL splitting; in any case it affects versions before that.
The problem is not in ZK as such but in internal state tracking in master, it seems.
Master:
2019-04-21 01:49:49,584 INFO [master/<master>:17000.splitLogManager..Chore.1] coordination.SplitLogManagerCoordination: Resubmitting task <path>.1555831286638
worker-rs, split fails
.... 2019-04-21 02:05:31,774 INFO [RS_LOG_REPLAY_OPS-regionserver/<worker-rs>:17020-1] wal.WALSplitter: Processed 24 edits across 2 regions; edits skipped=457; log file=<path>.1555831286638, length=2156363702, corrupted=false, progress failed=true
Master (not sure about the delay of the acquired-message; at any rate it seems to detect the failure fine from this server)
2019-04-21 02:11:14,928 INFO [main-EventThread] coordination.SplitLogManagerCoordination: Task <path>.1555831286638 acquired by <worker-rs>,17020,1555539815097 2019-04-21 02:19:41,264 INFO [master/<master>:17000.splitLogManager..Chore.1] coordination.SplitLogManagerCoordination: Skipping resubmissions of task <path>.1555831286638 because threshold 3 reached
After that this task is stuck in the limbo forever with the old worker, and never resubmitted.
RS never logs anything else for this task.
Killing the RS on the worker unblocked the task and some other server did the split very quickly, so seems like master doesn't clear the worker name in its internal state when hitting the threshold... master never restarted so restarting the master might have also cleared it.
This is extracted from splitlogmanager log messages, note the times.
2019-04-21 02:2 1555831286638=last_update = 1555837874928 last_version = 11 cur_worker_name = <worker-rs>,17020,1555539815097 status = in_progress incarnation = 3 resubmits = 3 batch = installed = 24 done = 3 error = 20, .... 2019-04-22 11:1 1555831286638=last_update = 1555837874928 last_version = 11 cur_worker_name = <worker-rs>,17020,1555539815097 status = in_progress incarnation = 3 resubmits = 3 batch = installed = 24 done = 3 error = 20}
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